情态动词用法ChristopherYoungcan,may,must表示推测时用法情态动词肯定句否定句疑问句MustCan/couldMay/might一定Can’t不可能可能吗可能Maynot可能不can,could可以在肯定句中表示“有时会”,表示客观情形一:基本用法区别1,对正在进行动作推测:can/could,may/might,must+bedoing他不在教室,一定在操场打球Heisn’tintheclassroom.Hemustbeplayingbasketballintheplayground.2,对过去、已经发生的事进行推测:情态动词+havedone过去一定做过musthavedone过去可能做过(肯定,否定)may/mighthavedone过去可能做过(否定,疑问)can/couldhavedone二、表示推测时的时态Exercise:1,我的书不见了,谁有可能拿走了?Mybookisgone,Who____________itaway?2,我们最好快点。老师一定在等我们。We’dbetterhurryup,ourteacher___________forus.3,李先生上周出国了,所以你不可能在昨天的会议上看到他。MrLiwentabroadlastweek,soyou___________himatthemeeting4,这个咖啡很甜,你一定在里面加了许多糖。Thiscakeisverysweet.You___________alotofsugarinit.5,现在六点了,他可能已经回来。It’ssixnow,Hemighthavecomebackcouldhavetakenmustbewaitingcouldn’thaveseenmusthaveputHemust/maybereading,____he?Youmustdoityourself,____you?Itmusthaverained,______it?Itmusthaverainedlastnight,_____it?三、表猜测语气的反意疑问句的构成isn’tdon’thasn’tdidn’t•情态动词表示情态的用法:情感、态度:允许、禁止、愿意、请求、能够等几个重要单词:一:must1,(主观)---MustIleavenow?---No,you_____.---____IwatchTvaftersupper,mum?---No,you____finishyourhomeworkfirst.A,Must;needn’tB,Could;mustn’tC,Can;mayD,May;must2,Hemustn’tstaywithyou.中文:3,(第二,三人称后,多半是疑问句)站在那儿的女孩是谁?哦,如果你非得知道,她的名字是Sara---Whoisthegirlstandingoverthere?---Well,ifyoumustknow,hernameisSara.你非得这么晚了弹钢琴吗?Mustyouplaythepianoatsuchalatetime?必须Dneedn’t/don’thaveto表示说话人不耐烦“非得要”禁止他二:can表示_______________1.--CouldIhaveaccesstoyourcomputer?could表示______--Certainly,you_______2.事实显示,他能找到问题的解决方案Asitturnsout,hecanfindthesolutiontotheproblem3.夜间这里有时会/可能会很冷Itcangetquitecoldhereatnight.注意:couldwas/wereabletoHe_________fleeEuropebeforethewarbrokeout.4.can/could+not/never(_____)+too/enough(_____)表示:______________我再怎么感谢他也不为过Ican’tthankhimtoomuch过去一直有的能力过去通过努力成功地做了一个具体的事wasableto许可委婉语气can能力有时会否定程度再怎么也不为过三:shall的用法1,第一第三人称之后表示________Whatshallhedoifhefailsagain?2,用各种人称之后,表示___________________Tommyshallhaveatoyifhebehaveswell.Heshallsufferforthisifherefusestoobeyme3,用于表示_______________所规定的内容Intherulesitsaysthateachcompetitorshallwearanumber.Allshallremainintheirseatsuntilallthepapershavebeencollected.征求意见命令,警告,威胁,允诺法律协议合同制度may1.等于can,表示_____2.may/mightaswelldo表示______你不妨向同学呼吁重视精神健康Youmightaswellappealtostudentstoattachimportancetomentalhealthaswell.3.表示_____祝你健康长寿Mayyourfatherhavelongandhappylife.许可不妨做…祝愿will/would1.第_____人称表示________如:_______2.will表示事物的_____________油总是浮在水的表面门昨天就不是开不开无论我怎么试,车就是不发动3.will表示______可以译成__________我不会再信任你4.would表示________wouldn’t表示______无论他多么晚,他母亲总是会等他Howeverlatehewas,hismumwouldwaitforhim.昨天即使你告知真相,他就是不会接受Hewouldn’tacceptthefactevenifyoutoldthetruth.一,二征求意见will/wouldyouplease…属性功能意愿愿意,会OilwillfloatonwaterThedoorwouldn’topenyesterday.HoweverItry...